#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){
    int i;
    for(i = 0; s[i] != '\0'; i++);
    return i;
}
 
// 関数の中でtmpに対してmallocして
// そこに回文を代入してreturnで返しましょう
char *setPalindrome(char s[]){
    int i;
    int len = myStrlen(s);
 
    char *tmp = (char *)malloc((2 * len + 1) * sizeof(char));
 
    for(i = 0; i < len; i++){
        tmp[i] = s[i];
    }
    for(i = 0; i < len; i++){
        tmp[len + i] = s[len - 1 - i];
    }
 
    tmp[2 * len] = '\0';
 
    return tmp;
}
 
 
//メイン関数はいじる必要はありません
int main(){
    int i;
    char nyuryoku[1024];
    char *kaibun;
    scanf("%s", nyuryoku);
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
    free(kaibun);
    return 0;
}
 

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

YWJjZA==

abcd